High performance mixed signal (HPMS) platforms require stringent overall system and subsystem performance. The ability to design ultra-low power systems is used in a wide range of platforms including consumer, mobile, identification, healthcare products and microcontrollers. In this paper we present an overview of low power design techniques, challenges and opportunities faced in an industrial res...
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This paper presents analytical expressions for the class-EM power amplifier, taking into account the fundamental-frequency and harmonic components of output currents in the main and auxiliary circuits. By using the proposed expressions, design values for satisfying not only the class-EM ZVS/ZDVS/ZCS/ZDCS conditions of the main circuit, but also the ZVS condition of the auxili...
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This paper presents analytical expressions for the sub-nominal operation, which is only the zero current switching (ZCS) condition, of the class-E power amplifier with a shunt inductor at any duty ratio. The duty ratio is considered not only as a design specification but also as an adjustment parameter. In the sub-nominal operation with any duty ratio, both the peak switch voltage and the peak swi...
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A single-lane, dual-channel, 5-Gb/s serial link redriver with no clock data recovery (CDR) or phase-locked loop (PLL) has been developed by using a standard 0.13- μm CMOS technology. New features and techniques have been developed in both the architecture and the analog modules to meet the jitter and protocol requirements for a redriver for multi-Gb/s operation, which is made difficult by t...
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The architecture of a single-chip dual-polarization QPSK/BPSK 50 Gigabits per second (Gb/s) DSP-based transceiver for coherent optical communications is presented. The receiver compensates the chromatic dispersion (CD) of more than 3,500 km of standard single-mode fiber using a frequency-domain equalizer. A time-domain four-dimensional MIMO transversal equalizer compensates up to 200 ps of differe...
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This paper proposes a novel CMOS bandgap reference (BGR) with high-order curvature-compensation by using MOS transistors operating in weak inversion region. The mechanism of the proposed curvature-compensation technique is analyzed thoroughly and the corresponding BGR circuit was implemented in standard CMOS 0.18 μm technology. The experimental results show that the proposed BGR achieves 4....
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This paper presents an organic sensor for ambient light monitoring fabricated on flexible plastic foil. The sensor exploits an organic photodiode whose photocurrent is linearly converted into an output voltage by a transconductance operational amplifier in a feedback configuration. The photodiode is based on an inkjet printed bulk heterojunction blend of P3HT/PCBM sandwiched between Au and Al elec...
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Crystal oscillators are widely used in electronic systems to provide reference timing signals. Even though they are designed to be highly stable, their performance can be deteriorated by several types of random noise sources and deterministic interferences. This paper investigates the phenomenon of timing jitter in crystal oscillators induced by the injection of deterministic interferences. It is ...
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A Richards immitance is a positive real function expressed in terms of the Richards variable λ = tanh(pτ) = Σ+jΩ where p=σ+jω is the classical complex frequency. A Richards immittance can be synthesized as a lossless two port terminated in a resistance as in Darlington's synthesis such that the two-port consists of commensurate transmission lines. In this ...
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A 10-Gb/s serial link transceiver is demonstrated using double-edged pulsewidth modulation to overcome frequency-dependent losses in electrical interconnects. Time domain modulation is discussed as a means to enhance the spectral efficiency in channels with sharp frequency roll-off similar to multilevel voltage-domain modulation such as 4-PAM. The transmitter and receiver are high-speed programmab...
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A 16-core processor with both message-passing and shared-memory inter-core communication mechanisms is implemented in 65 nm CMOS. Message-passing communication is enabled in a 3 × 6 Mesh packet-switched network-on-chip, and shared-memory communication is supported using the shared memory within each cluster. The processor occupies 9.1 mm2 and operates fully functional at a clock ...
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This work presents a novel approach based on gate-level analysis for implementing Selective State Retention Power Gating (SSRPG). A selective SRPG approach mitigates the area and power overhead of the conventional SRPG technique. However, only very few papers suggesting a selective SPRG approach were published. The proposed SSRPG technique employs a formal analysis and, therefore, does not require...
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Compressive sensing has been used to overcome communication constraints (energy and bandwidth) in low-power sensors. In this work, we present a seizure-detection processor that directly uses compressively-sensed electroencephalograms (EEGs) for embedded signal analysis. In addition to addressing communication, this has two advantages for local computation. First, with compressive sensing, reconstr...
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Complex arithmetic operations are widely used in Digital Signal Processing (DSP) applications. In this work, we focus on optimizing the design of the fused Add-Multiply (FAM) operator for increasing performance. We investigate techniques to implement the direct recoding of the sum of two numbers in its Modified Booth (MB) form. We introduce a structured and efficient recoding technique and explore...
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Recently, considerable research has been performed in cryptography and security to optimize the area, power, timing, and energy needed for the point multiplication operations over binary elliptic curves. In this paper, we propose an efficient implementation of point multiplication on Koblitz curves targeting extremely-constrained, secure applications. We utilize the Gaussian normal basis (GNB) rep...
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A design methodology for incorporating Residue Number System (RNS) and Polynomial Residue Number System (PRNS) in Montgomery modular multiplication in GF(p) or GF(2n) respectively, as well as a VLSI architecture of a dual-field residue arithmetic Montgomery multiplier are presented in this paper. An analysis of input/output conversions to/from residue representation, along with the prop...
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The consensus problem of multiagent nonlinear systems (MANNs) with variable structure is discussed in this paper. T-S fuzzy models are first presented to describe MANNs with variable structure. The nodes of each T-S fuzzy model are rearranged so that the global fuzzy model is decomposed into independent and small-scale fuzzy models. It is shown that the consensus of the global fuzzy model is equiv...
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Digital control of switching power converters is an area which has seen increased attention in recent years. However, quantization in the feedback loop from the analog-to-digital (A/D) converter and the digital pulse width modulator (DPWM) may cause limit cycle oscillations to manifest, which are generally seen as being undesirable. This paper presents an analysis of the limit cycle behavior found...
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High-accuracy implementation of biological neural networks is a computationally expensive task, specially, for large-scale simulations of neuromorphic algorithms. This paper proposes a set of models for biological spiking neurons, which are efficiently implementable on digital platforms. Proposed models can reproduce different biological behaviors with a high precision. The proposed models are inv...
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In this paper, the synchronization problem is investigated for a class of nonlinear delayed dynamical networks with heterogeneous impulsive effects. The intrinsic properties of heterogeneous impulses are that impulsive strengths are inhomogeneous in both time and space domains, i.e., the impulsive effect in each node is not only nonidentical from each other, but also time-varying at different impu...
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This paper proposes an electronically reconfigurable Doherty amplifier capable of efficiently amplifying multi-standard multi-band wireless signals centered at widely spaced frequencies. The paper outlines closed form equations for an effective design methodology of frequency agile Doherty amplifiers driven with multi-mode signals using a small number of electronically tunable devices. As a proof ...
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